This system forms a detached,[5] single-lined spectroscopic binary[3] with an orbital period of 39.5 days and a low eccentricity of 0.04.[8] Its binary nature was discovered in 1899 by American astronomer W. W. Campbell and the first orbital determination was made in 1910 by Canadian astronomer J. S. Plaskett.[12] The orbital plane is nearly aligned with the line of sight to the Earth, so the pair forms an eclipsing binary. The primary eclipse has a minimum of 4.23 in magnitude, while the secondary minimum is magnitude 4.21.[2] This eclipsing behavior was discovered by German astronomer P. Guthnick using observations between 1946 and 1947.[12]
^ abcdevan Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ abcdAvvakumova, E. A.; et al. (October 2013), "Eclipsing variables: Catalogue and classification", Astronomische Nachrichten, 334 (8): 860, Bibcode:2013AN....334..860A, doi:10.1002/asna.201311942, hdl:10995/27061
^ abcdefghiStrassmeier, K. G.; et al. (October 2012), "Rotation, activity, and lithium abundance in cool binary stars", Astronomische Nachrichten, 333 (8): 663, arXiv:1208.3741, Bibcode:2012AN....333..663S, doi:10.1002/asna.201211719, S2CID 118450304.
^ abNicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
^ abcRedfield, S.; et al. (June 2006), "A Cycle-4 Survey of RS CVn Binary Systems", in Sonneborn, G.; Moos, H.; Andersson, B.-G. (eds.), Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Conference held 2-6 August, 2004 in Victoria, British Columbia, Canada, vol. 348, p. 269, Bibcode:2006ASPC..348..269R.
^ abKarataș, Yüksel; Bilir, Selçuk; Eker, Zeki; Demircan, Osman; Liebert, James; Hawley, Suzanne L.; Fraser, Oliver J.; Covey, Kevin R.; Lowrance, Patrick; Kirkpatrick, J. Davy; Burgasser, Adam J. (2004). "Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution". Monthly Notices of the Royal Astronomical Society. 349 (3): 1069–1092. arXiv:astro-ph/0404219. Bibcode:2004MNRAS.349.1069K. doi:10.1111/j.1365-2966.2004.07588.x. S2CID 15290475.
^Böhm-Vitense, Erika; et al. (December 2000), "Ultraviolet Emission Lines in BA and Non-BA Giants", The Astrophysical Journal, 545 (2): 992–999, Bibcode:2000ApJ...545..992B, doi:10.1086/317850.
^ abPourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
^Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^"MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 20 December 2022.
^ abClimenhaga, J. L.; et al. (November 1950), "Spectrographic observations of Epsilon Ursae Minoris", Publications of the Dominion Observatory Ottawa, 8: 401–408, Bibcode:1950PDAO....8..401C.
^de Medeiros, J. R. (June 2004), Maeder, Andre; Eenens, Philippe (eds.), "The Rotation of Red Giants and Horizontal Branch Stars (Invited Review)", Stellar Rotation, Proceedings of IAU Symposium No. 215, held 11-15 November, 2002 in Cancun, Yucatan, Mexico, San Francisco: Astronomical Society of the Pacific, vol. 215, p. 144, Bibcode:2004IAUS..215..144D
^Mason, B. D.; et al. (2008), , U. S. Naval Observatory, Washington D.C., archived from the original on 2011-02-14, retrieved 2017-09-15.
External linksEdit
Kaler, James B., "Epsilon Ursae Minoris", Stars, University of Illinois, retrieved 2017-09-15.
eps UMi, AAVSO, retrieved 2017-09-15.
October 20, 2023
epsilon, ursae, minoris, ursae, minoris, binary, star, system, northern, circumpolar, constellation, ursa, minor, visible, naked, with, combined, apparent, visual, magnitude, based, upon, annual, parallax, shift, seen, from, earth, located, around, light, year. Epsilon Ursae Minoris e Ursae Minoris is a binary star 10 system in the northern circumpolar constellation of Ursa Minor It is visible to the naked eye with a combined apparent visual magnitude of 4 19 2 Based upon an annual parallax shift of 10 73 mas as seen from the Earth it is located around 300 light years from the Sun The pair are drawing nearer to the Sun with a radial velocity of 10 57 km s 6 Epsilon Ursae MinorisLocation of e Ursae Minoris circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Ursa MinorRight ascension 16h 45m 58 24168s 1 Declination 82 02 14 1233 1 Apparent magnitude V 4 19 2 CharacteristicsSpectral type G5 III A8 F0 V 3 U B color index 0 55 4 B V color index 0 89 4 Variable type Eclipsing 2 and RS CVn 5 AstrometryRadial velocity Rv 10 57 0 40 6 km sProper motion m RA 19 47 1 mas yr Dec 2 61 1 mas yrParallax p 10 73 0 39 mas 1 Distance300 10 ly 93 3 pc Absolute magnitude MV 0 922 7 Orbit 8 Period P 39 48042 0 00012 3 Eccentricity e 0 04Periastron epoch T 2433083 47 JDArgument of periastron w secondary 323 5 Semi amplitude K1 primary 31 8 km sDetailse UMi ASurface gravity log g 3 21 0 08 3 cgsTemperature5 215 47 3 KMetallicity Fe H 0 25 0 04 3 dexRotational velocity v sin i 25 6 3 km sOther designationse UMi 22 Ursae Minoris BD 82 498 FK5 912 GC 22749 HD 153751 HIP 82080 HR 6322 SAO 2770 ADS 10242 CCDM 16460 8203 9 Database referencesSIMBADdata A light curve for Epsilon Ursae Minoris plotted from TESS data 11 This system forms a detached 5 single lined spectroscopic binary 3 with an orbital period of 39 5 days and a low eccentricity of 0 04 8 Its binary nature was discovered in 1899 by American astronomer W W Campbell and the first orbital determination was made in 1910 by Canadian astronomer J S Plaskett 12 The orbital plane is nearly aligned with the line of sight to the Earth so the pair forms an eclipsing binary The primary eclipse has a minimum of 4 23 in magnitude while the secondary minimum is magnitude 4 21 2 This eclipsing behavior was discovered by German astronomer P Guthnick using observations between 1946 and 1947 12 The primary is an evolved G type giant star with a stellar classification of G5 III The secondary is a main sequence star with a class in the range A8 F0 V 3 One of the pair is an active RS Canum Venaticorum type variable star 5 which is causing the net brightness to vary with a period that matches the orbital period of the binary The primary has a high projected rotational velocity of 25 6 km s 3 which is likely the result of synchronization effects from tidal interaction with the secondary 13 Epsilon Ursae Minoris has a visual companion a magnitude 12 32 star at an angular separation of 77 0 arc seconds along a position angle of 2 as of 2014 14 References Edit a b c d e van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Avvakumova E A et al October 2013 Eclipsing variables Catalogue and classification Astronomische Nachrichten 334 8 860 Bibcode 2013AN 334 860A doi 10 1002 asna 201311942 hdl 10995 27061 a b c d e f g h i Strassmeier K G et al October 2012 Rotation activity and lithium abundance in cool binary stars Astronomische Nachrichten 333 8 663 arXiv 1208 3741 Bibcode 2012AN 333 663S doi 10 1002 asna 201211719 S2CID 118450304 a b Nicolet B 1978 Photoelectric photometric Catalogue of homogeneous measurements in the UBV System Astronomy and Astrophysics Supplement Series 34 1 49 Bibcode 1978A amp AS 34 1N a b c Redfield S et al June 2006 A Cycle 4 Survey of RS CVn Binary Systems in Sonneborn G Moos H Andersson B G eds Astrophysics in the Far Ultraviolet Five Years of Discovery with FUSE ASP Conference Series Vol 348 Proceedings of the Conference held 2 6 August 2004 in Victoria British Columbia Canada vol 348 p 269 Bibcode 2006ASPC 348 269R a b Karataș Yuksel Bilir Selcuk Eker Zeki Demircan Osman Liebert James Hawley Suzanne L Fraser Oliver J Covey Kevin R Lowrance Patrick Kirkpatrick J Davy Burgasser Adam J 2004 Kinematics of chromospherically active binaries and evidence of an orbital period decrease in binary evolution Monthly Notices of the Royal Astronomical Society 349 3 1069 1092 arXiv astro ph 0404219 Bibcode 2004MNRAS 349 1069K doi 10 1111 j 1365 2966 2004 07588 x S2CID 15290475 Bohm Vitense Erika et al December 2000 Ultraviolet Emission Lines in BA and Non BA Giants The Astrophysical Journal 545 2 992 999 Bibcode 2000ApJ 545 992B doi 10 1086 317850 a b Pourbaix D et al 2004 SB9 The Ninth Catalogue of Spectroscopic Binary Orbits Astronomy amp Astrophysics 424 727 732 arXiv astro ph 0406573 Bibcode 2004A amp A 424 727P doi 10 1051 0004 6361 20041213 S2CID 119387088 eps UMi SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2017 09 14 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link Eggleton P P Tokovinin A A September 2008 A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869 879 arXiv 0806 2878 Bibcode 2008MNRAS 389 869E doi 10 1111 j 1365 2966 2008 13596 x S2CID 14878976 MAST Barbara A Mikulski Archive for Space Telescopes Space Telescope Science Institute Retrieved 20 December 2022 a b Climenhaga J L et al November 1950 Spectrographic observations of Epsilon Ursae Minoris Publications of the Dominion Observatory Ottawa 8 401 408 Bibcode 1950PDAO 8 401C de Medeiros J R June 2004 Maeder Andre Eenens Philippe eds The Rotation of Red Giants and Horizontal Branch Stars Invited Review Stellar Rotation Proceedings of IAU Symposium No 215 held 11 15 November 2002 in Cancun Yucatan Mexico San Francisco Astronomical Society of the Pacific vol 215 p 144 Bibcode 2004IAUS 215 144D Mason B D et al 2008 Washington Visual Double Star Catalog 2006 5 WDS U S Naval Observatory Washington D C archived from the original on 2011 02 14 retrieved 2017 09 15 External links EditKaler James B Epsilon Ursae Minoris Stars University of Illinois retrieved 2017 09 15 eps UMi AAVSO retrieved 2017 09 15 Retrieved from https en wikipedia org w index php title Epsilon Ursae Minoris amp oldid 1154744742, wikipedia, wiki, book, books, library,
